[Reland-fixing asan failure] Tablet-like power button behavior on Convertible/Tablet ChromeOS devic…

chromeos/dbus/fake_power_manager_client.cc

Index: chromeos/dbus/fake_power_manager_client.cc
diff --git a/chromeos/dbus/fake_power_manager_client.cc b/chromeos/dbus/fake_power_manager_client.cc
index 6bee1ea7369bfc50732bb4412c02ed2ee6ce210e..db6747d5d01e324500c708946df52cc688b6b7ba 100644
--- a/chromeos/dbus/fake_power_manager_client.cc
+++ b/chromeos/dbus/fake_power_manager_client.cc
@@ -14,7 +14,7 @@ namespace chromeos {
 
 namespace {
 // Minimum power for a USB power source to be classified as AC.
-const double kUsbMinAcWatts = 24;
+constexpr double kUsbMinAcWatts = 24;
 }
 
 FakePowerManagerClient::FakePowerManagerClient()
@@ -183,6 +183,12 @@ void FakePowerManagerClient::SendDarkSuspendImminent() {
     observer.DarkSuspendImminent();
 }
 
+void FakePowerManagerClient::SendBrightnessChanged(int level,
+                                                   bool user_initiated) {
+  for (auto& observer : observers_)
+    observer.BrightnessChanged(level, user_initiated);
+}
+
 void FakePowerManagerClient::SendPowerButtonEvent(
     bool down,
     const base::TimeTicks& timestamp) {